In which of the following places is it more difficult to determin if there is pollution?

aquifer

stream

pond

air

The theories on the expansion of galaxies maybe re-examined to strengthen science should not be tested to strengthen science will weaken scientific knowledge if they change will become laws if they don't change

Recombinant dna (rdna) creates offspring which are genetically identical to the parent is the process of breeding only organisms with desirable traits involves the removal of the nucleus of a cell combines genes from organisms of different species in a lab

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this